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Finding the Fourth Proportional to 618.99, 854.72 and 386.19

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Solution

The fourth proportional to 618.99, 854.72 and 386.19 is: 533.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.99 : 854.72 = 386.19 : x
  2. Step 2: Convert to fraction form
    618.99/854.72 = 386.19/x
  3. Step 3: Cross multiply
    618.99x = 854.72 × 386.19
  4. Step 4: Simplify right side
    618.99x = 330,082.39
  5. Step 5: Solve for x
    x = 330,082.39/618.99
  6. Step 6: Final answer
    x = 533.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.